'Grain density is only one of many factors although obviously important as Jamie points out. People should consult ANC-19 for guidance on grading.
I have more trouble finding suitable edge grained, non-spiraled, and limited knot hole material for large pieces. This is where splicing & laminating can come in handy since you get more opportunities to use good material and work around poor quality material that shows up as variation in a longish raw board.
While Spruce is expensive and limited in the sizes they can supply, in my experience they generally do a good job on grading and supplying decent quality pieces for spar-sized material. The material they supply for capstrip sized pieces is not as uniform but I'll accept some throwaway there. It isn't worth my time to make capstrip when it can be bought cheaply.
To:
fairchildclub@yahoogroups.com
From:
jamietreat@q.com
Date: Thu, 24 Jan 2013 14:17:07 -0700
Subject: RE: [fairchildclub] Spruce Spar Material
The bigger problem is the quality (rings per inch) is just large which
equals less strength.
JST
-----Original Message-----
From:
fairchildclub@yahoogroups.com [mailto:
fairchildclub@yahoogroups.com]
On Behalf Of Russell Williams
Sent: Thursday, January 24, 2013 12:19 PM
To:
fairchildclub@yahoogroups.com
Subject: RE: [fairchildclub] Spruce Spar Material
Depending on how big a spar you need, I suggest lamination as the way to
make up larger sized pieces. It is more work but results in a superior
product.
For large material I've had to buy out of private stashes. Wicks & Spruce
have set up exclusivity agreements that have locked out private buyers from
the yards in Washington state that used to sell direct. I'm told there is a
supplier in Elma that will still sell direct but I have no personal
experience there.
To:
fairchildclub@yahoogroups.com
From:
seifertr@verizon.net
Date: Thu, 24 Jan 2013 11:04:41 -0800
Subject: [fairchildclub] Spruce Spar Material
Does anyone in the club have a Spruce spar supplier they've delt with
recently, besides Aircraft Spruce and wicks? One of our builders wants spar
material for his F-24 and was told they can't supply pieces that large.
Thanks
Rich Seifert 909-790-1320
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